We did the weekend thing and in the end boys were not enjoying and I hated it as well as they were crying during lessons and not wanting to do things etc so we stopped and have not yet managed to go back.

I don't like idea of another child sitting in pram while parent in pool as worry about breaks failing or them leaning and tipping pram.

Now both of mine are over 3 so would be fine as would be in on there own.